Logical units and target ports on NetApp E-Series storage systems
LUNs are provisioned from the NetApp E-Series as volumes. These LUNs appear as MDisks on Storwize® V3500, which can be used to create storage pools and provision volumes for use by hosts or with tiering.
LUN size
For regular volume groups, the maximum volume size is limited only by the size of the drives and the maximum number of drives in the volume group based on the RAID level. For an example, in RAID 5 and RAID 6 volume groups, the maximum number of drives in the volume group is 30. For Dynamic Disk Pool, the maximum volume size is 64 TB.
LUN mapping
NetApp E-Series can export 256 LUNs to Storwize V3500, which is the limit. Storwize V3500 supports greater than 2 TB LUNs and has a maximum LUN size of 1 PB.
LUN IDs
NetApp E-Series systems identify exported logical units through SCSI identification descriptor type 3. The 64-bit NAA IEEE Registered Extended Identifier (NAA=6) for the logical unit is in the form 6-OUI-VSID. The LSI NetApp E-Series IEEE company ID is 0x00A0B8. NetApp E-Series IEEE company ID is 0x0080E5. The remaining part of the company ID is a vendor-specific ID.
Storwize V3500 configuration (includes logical drives and hosts)
In general, settings are default unless specified. For further details, see the information about NetApp E-Series configuration settings.
LUN modification, resizing, or deletion
- Make sure the MDisk is unmanaged (removed from any storage pool) on the Storwize V3500 system before you delete the LUN on the NetApp E-Seriesstorage system.
- Do not use array expansion on LUNs that are in use by a Storwize V3500 system. To be recognized by Storwize V3500, the MDisk must first be made unmanaged by migrating or deleting from the storage pool.
LUN presentation
LUNs are exported through the available FC ports of the NetApp E-Series storage system. Configure these LUNs explicitly. Do not use default mapping to guarantee unique Storwize V3500 access.
Special LUNs
There are no special considerations for logical unit numbering. LUN 0 can be exported where necessary.
The access LUN, also known as the Universal Transport Mechanism (UTM) LUN, is the configuration interface for NetApp E-Seriessystems. The access LUN might not be in a partition that contains the Storwize V3500 ports because it is not required by the Storwize V3500system. The UTM LUN is a special LUN that allows NetApp E-Series systems to be configured through suitable software over the Fibre Channel connection.
Because Storwize V3500 does not require the UTM LUN, it does not generate errors either way.NetApp E-Series systems must not have the Access UTM LUN that is presented as LUN 0 (zero).
It is possible to use in-band (over Fibre Channel) and out-of-band (over Ethernet) to allow the configuration software to communicate with more than one NetApp E-Series system. If you are using in-band configuration, configure the Access UTM LUN in a partition that does not include any logical units that are accessed by Storwize V3500.
Target ports
- E26xx: 8 Gb FC
- E54xx: 8 Gb FC
- EF540: 8 Gb FC
- E27xx: 16 Gb FC
- E55xx: 16 Gb FC
- EF550: 16 Gb FC
20020080e5290640: WWNN
20120080e5290640: so this a WWPN for Port 1 on Controller A
20430080e5290640: so this a WWPN for Port 4 on Controller B
For
more information about target ports, refer to Storage array
profile on the summary tab in the NetApp SANtricity Storage
Manager GUI. LU access model
All systems are Asymmetric Active/Active. To avoid an outage from system failure, cross connect the ports across Fibre Channel switches. Because all model NetApp E-Seriesstorage systems are equal in priority, there is no benefit to using an exclusive set for a specific LU.
LU preferred access port
There are no preferred access ports on the model NetApp E-Series as all ports are Asymmetric Active/Active across all controllers.